A00

Operating System Software Not Installed

Mitsubishi Electric · MELSEC iQ-R Motion Controller

What does A00 mean?

This fault indicates that the operating system software required for the Motion CPU module is not installed. The module is in an uninitialized state, presenting as installation mode.

Common Causes

  • Operating system software missing from the Motion CPU module

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Put the Motion CPU module in installation mode.

  2. 2

    Install the operating system software using MT Developer2.

Browse all codes in this manual (19)
Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric MELSEC iQ-R Motion Controller
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